From The TimeSplitters Wiki

 The Colonel appeared only in TS2. He was the boss enemy at the end of the Wild West level, in a shootout between Elija Jones. He appears as an elderly Confederate soldier, whom apparently deserted from the civil war. His profile states he went into south America in search of gold, but returned with strang allies. In the fight with him, he yells the following: "You better git while the gittins' good!", "Me an' my boys are gonna whip your furry hide!", "I'm gonna fill you full of lead!", and "I'm the Colonel, nobody messes with me!"